/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.apache.streampipes.commons.constants;

import java.util.Map;

public class CustomEnvs {

  public static boolean exists(String envVariable) {
    return AllEnvs.INSTANCE.getEnvs().containsKey(envVariable);
  }

  public static String getEnv(String envVariable) {
    return AllEnvs.INSTANCE.getEnvs().get(envVariable);
  }

  public static Integer getEnvAsInt(String envVariable) {
    return Integer.parseInt(getEnv(envVariable));
  }

  public static Boolean getEnvAsBoolean(String envVariable) {
    return Boolean.parseBoolean(getEnv(envVariable));
  }

  private enum AllEnvs {
    INSTANCE;

    private final Map<String, String> envs;

    AllEnvs() {
      this.envs = System.getenv();
    }

    public Map<String, String> getEnvs() {
      return envs;
    }
  }
}
